Chain length calculator
Chain length in links from your chainstay and biggest gears, plus each maker's check on the bike.
Check on the bike: chain on the largest ring and largest cog, then add
| Drivetrain | Add |
|---|---|
| Shimano road 12-speed105, Ultegra, Dura-Ace | 2–3 links + QUICK-LINKUDH: 1–2 links + QUICK-LINK |
| Shimano GRX 12-speed 2xRD-RX820 | 3–4 links + QUICK-LINKUDH: 2–3 links + QUICK-LINK |
| Shimano GRX 12-speed 1xRD-RX822 | 4–5 links + QUICK-LINK |
| Shimano GRX Di2 12-speedRD-RX825 | 3–4 links + QUICK-LINK |
| SRAM road 2x10, 11, 12-speed | 1 inner + 1 outer link |
| SRAM road 1x10, 11, 12-speed | 2 inner + 2 outer links |
| SRAM XPLR 13-speedFull Mount | No wrap: SRAM's guideby chainstay and chainring |
| Other or not surePark Tool | 1 in (2 rivets)1x, 42T+ cog: 2 in (4 rivets) |
A starting point. Confirm on the bike with your drivetrain maker's method. Shimano's count depends on which plate sits at the end of the wrap. Sources: Park Tool equation and sizing guide; Shimano dealer's manuals for road Di2, 105 RD-R7100, GRX RX820/RX822 and GRX Di2; SRAM chains manual.